. >> it's one of several scenarios facing president obama and governor romney. >> you could have romney winning the popular vote but losing the electoral vote. >> 270 electoral votes are needed to clinch the presidency but in another hypothetical, george condon says both candidates could fall short. >> if you have the right combination of states breaking, you could have an electoral vote tie of 269-269. which would be a real mess. >> that would leave the decision up to congress. >> in that case, we start pushing into relatively unknown territory of the house of representatives electing the president in a special way. >> if the house keeps its republican majority, mitt romney would be favored to win the white house but the senate elects the vice president and if that stays in democrats' hands, joe biden would probably be their pick. a romney-ben administration? most presidential prognosticators say it's unlikely at this point but not totally out of the realm of possibility. >> new york mayor and john's hopkins university graduate michael bloomberg was in baltimore last night rally for th